DE3175918D1 - Contrast enhancement method - Google Patents

Contrast enhancement method

Info

Publication number
DE3175918D1
DE3175918D1 DE8181108501T DE3175918T DE3175918D1 DE 3175918 D1 DE3175918 D1 DE 3175918D1 DE 8181108501 T DE8181108501 T DE 8181108501T DE 3175918 T DE3175918 T DE 3175918T DE 3175918 D1 DE3175918 D1 DE 3175918D1
Authority
DE
Germany
Prior art keywords
signal
image signal
image
dot
recording medium
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
DE8181108501T
Other languages
English (en)
Inventor
Hans-Georg Knop
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Heidelberger Druckmaschinen AG
Original Assignee
Dr Ing Rudolf Hell GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dr Ing Rudolf Hell GmbH filed Critical Dr Ing Rudolf Hell GmbH
Application granted granted Critical
Publication of DE3175918D1 publication Critical patent/DE3175918D1/de
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/40—Picture signal circuits
    • H04N1/409—Edge or detail enhancement; Noise or error suppression
    • H04N1/4092—Edge or detail enhancement
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/024—Details of scanning heads ; Means for illuminating the original
    • H04N1/028—Details of scanning heads ; Means for illuminating the original for picture information pick-up
    • H04N1/029—Heads optically focused on only one picture element at a time

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Image Processing (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)
  • Facsimile Image Signal Circuits (AREA)
  • Facsimile Scanning Arrangements (AREA)
  • Soft Magnetic Materials (AREA)
  • Steroid Compounds (AREA)
  • Editing Of Facsimile Originals (AREA)
  • Apparatus For Radiation Diagnosis (AREA)
DE8181108501T 1981-10-19 1981-10-19 Contrast enhancement method Expired DE3175918D1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP81108501A EP0077410B1 (de) 1981-10-19 1981-10-19 Verfahren zur Verbesserung der Kontrastanhebung

Publications (1)

Publication Number Publication Date
DE3175918D1 true DE3175918D1 (en) 1987-03-12

Family

ID=8187960

Family Applications (1)

Application Number Title Priority Date Filing Date
DE8181108501T Expired DE3175918D1 (en) 1981-10-19 1981-10-19 Contrast enhancement method

Country Status (8)

Country Link
US (1) US4521812A (de)
EP (1) EP0077410B1 (de)
JP (1) JPS5880970A (de)
AT (1) ATE25453T1 (de)
AU (1) AU557905B2 (de)
CA (1) CA1181838A (de)
DE (1) DE3175918D1 (de)
SU (1) SU1431695A3 (de)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4517599A (en) * 1983-01-27 1985-05-14 Hughes Aircraft Company Resolution enhancement and zoom by degradation estimates
JPS6081972A (ja) * 1983-10-12 1985-05-10 Canon Inc 画像処理システム
EP0141869B1 (de) * 1983-11-14 1987-09-16 DR.-ING. RUDOLF HELL GmbH Verfahren und Einrichtung zur Herstellung gerasterter Druckformen
US4706128A (en) * 1983-12-14 1987-11-10 Canon Kabushiki Kaisha Image reading and converting apparatus
JPS60162243A (ja) * 1984-02-02 1985-08-24 Fuji Photo Film Co Ltd 放射線画像情報読取方法
US4851922A (en) * 1984-02-29 1989-07-25 Canon Kabushiki Kaisha Video signal processing apparatus
JPH0685556B2 (ja) * 1984-03-30 1994-10-26 大日本スクリ−ン製造株式会社 画像走査記録装置における倍率変換方法
US5020118A (en) * 1984-06-13 1991-05-28 Canon Kabushiki Kaisha Image reading apparatus
JPS61242466A (ja) * 1985-04-19 1986-10-28 Ricoh Co Ltd 画像変倍方式
JPH0620240B2 (ja) * 1985-06-04 1994-03-16 大日本スクリーン製造株式会社 画像信号生成装置
FR2591367A1 (fr) * 1985-12-06 1987-06-12 Canon Kk Appareil de traitement de donnees d'image.
JPS63156475A (ja) * 1986-12-19 1988-06-29 Dainippon Screen Mfg Co Ltd 多階調画像読取装置
DE3761072D1 (de) * 1987-01-24 1990-01-04 Hell Rudolf Dr Ing Gmbh Blendenanordnung zur optoelektronischen abtastung von vorlagen.
DE4107703C2 (de) * 1991-03-09 1994-07-21 Hell Ag Linotype Verfahren und Vorrichtung zur Aufzeichnung gerasterter Bilder

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2691696A (en) * 1950-10-27 1954-10-12 Eastman Kodak Co Electrooptical unsharp masking in color reproduction
DE1039842B (de) * 1957-08-14 1958-09-25 Rudol Hell Dr Ing Verfahren zur kuenstlichen Kontraststeigerung an Tonwertspruengen und Konturen in mittels elektronischer Klischier-maschinen herzustellenden Klischees
GB1206681A (en) * 1967-03-22 1970-09-30 Printing Dev Inc Electronic reproduction of continuous image by half tone dots
US4122496A (en) * 1977-02-23 1978-10-24 International Business Machines Corporation Apparatus and method for digital halftone reproduction
JPS5429201A (en) * 1977-08-05 1979-03-05 Dainippon Screen Mfg Method of taking out sharpnesssheightened signal
JPS55146451A (en) * 1979-05-02 1980-11-14 Dainippon Screen Mfg Co Ltd Sharpness emphasis method in image scanning recorder
US4403258A (en) * 1980-11-07 1983-09-06 Ringier & Co., Ag. Method and device for sequentially imaging an original
JPH0310483Y2 (de) * 1980-11-21 1991-03-15
US4437122A (en) * 1981-09-12 1984-03-13 Xerox Corporation Low resolution raster images

Also Published As

Publication number Publication date
JPH05904B2 (de) 1993-01-07
US4521812A (en) 1985-06-04
JPS5880970A (ja) 1983-05-16
SU1431695A3 (ru) 1988-10-15
AU557905B2 (en) 1987-01-15
EP0077410B1 (de) 1987-02-04
CA1181838A (en) 1985-01-29
ATE25453T1 (de) 1987-02-15
AU8942182A (en) 1983-04-28
EP0077410A1 (de) 1983-04-27

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Legal Events

Date Code Title Description
8364 No opposition during term of opposition
8327 Change in the person/name/address of the patent owner

Owner name: LINOTYPE-HELL AG, 6236 ESCHBORN, DE

8339 Ceased/non-payment of the annual fee